-(z+9)+(3z+1)=-7(2+1)

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Solution for -(z+9)+(3z+1)=-7(2+1) equation:


Simplifying
-1(z + 9) + (3z + 1) = -7(2 + 1)

Reorder the terms:
-1(9 + z) + (3z + 1) = -7(2 + 1)
(9 * -1 + z * -1) + (3z + 1) = -7(2 + 1)
(-9 + -1z) + (3z + 1) = -7(2 + 1)

Reorder the terms:
-9 + -1z + (1 + 3z) = -7(2 + 1)

Remove parenthesis around (1 + 3z)
-9 + -1z + 1 + 3z = -7(2 + 1)

Reorder the terms:
-9 + 1 + -1z + 3z = -7(2 + 1)

Combine like terms: -9 + 1 = -8
-8 + -1z + 3z = -7(2 + 1)

Combine like terms: -1z + 3z = 2z
-8 + 2z = -7(2 + 1)

Combine like terms: 2 + 1 = 3
-8 + 2z = -7(3)

Multiply -7 * 3
-8 + 2z = -21

Solving
-8 + 2z = -21

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Add '8' to each side of the equation.
-8 + 8 + 2z = -21 + 8

Combine like terms: -8 + 8 = 0
0 + 2z = -21 + 8
2z = -21 + 8

Combine like terms: -21 + 8 = -13
2z = -13

Divide each side by '2'.
z = -6.5

Simplifying
z = -6.5

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